DBUS StartPeriodicDiscovery

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Hi all,
I've made a software using  DBUS StartPeriodicDiscovery monitoring in 
(almost) realtime bluetooth devices in range.
I've already used this software with many computer and bluetooth dongles 
without any problem (I've user it on a Asus eee with ubuntu and kernel 
2.6.22, in a debian with kernel 2.6.23 and so on).

Now I've installed it on a ebox 2300SX 
(http://www.compactpc.com.tw/ebox-2300SX.htm) using a customized debian 
4.0 to run on compact flash with kernel 2.6.22.
I have two different problem :
- When I made a proxy call to StartPeriodicDiscovery sometime i receive 
the response "Invalid argument", but if I made hciconfig hci0 reset 
before running the problem doesn't appear
- Events generated by StartPeriodicDiscovery (eg. RemoteDeviceFound) are 
never called

I can see the led of the bluetooth dongle blinking whene proxy call to 
StartPeriodicDiscovery  doesn't give error so I think periodic inquiry 
is running (I have not verified with hcidump because at the moment isnt' 
installed on the device and I can't install it )

The big difference from the 2300sx and the other installation is it 
doesn't have math coporcessor so I have compiled the kernel to support 
math emulation but I can't think this is the cause of my problems (why 
bluez should use math coprocessor?). Also in the dmesg of the device I 
found some error about ACPI ("ACPI: Unable to load the System 
Description Tables" and "pnp: PnP ACPI: disabled"), I'm not expert of 
ACPI but I think may cause some problems to usb devices...

Can someone give me a starting point to found the problem?

Many thanks

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